Initial cost is a big factor. When they first came out for the big rigs a 4" round tail/stop light was around 50 bucks, but the old incandescent type was around 4 bucks. With increased useage costs have come down a lot. Projected service life was 100,000 hours, or 24 hours a day for about 11 years. Main causes of failure in old style bulb/socket are moisture corrosion & vibration. Modern design of sealed contacts & shock mounts has greatly reduced light failure of incandescents. I have a 97 GMC p-up with all original bulbs still working.Power consumption doesn't seem to be enough to be concerned about except for some big rigs with 50 or 100 "chicken lites".My 2 cents worth.Willie

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